Originally Posted by
speedrestriction
It has been going on for several years at this stage. Not a big navigation issue, there is enough conventional navaid coverage to maintain accurate navigation certainly to RNP1.
Navaids in Northern Cyprus (the Turkish bit) are notoriously unreliable. Flying an aircraft with only VOR -DME updating to the IRS into Paphos a number of years ago resulted in a small map shift 1-2nm as the kit was picking up the poor navaids in the North such as Ercan. They can be deselected through the FMS before entering the area if you are aware of the problem.